华南农业大学学报2026，Vol.47Issue(3)：485-492,8.DOI:10.7671/j.issn.1001-411X.202507031
番石榴枝枯病菌生物学特性及防治药剂筛选
Biological characteristics of the guava twig blight pathogen and screening of its control fungicides
摘要
Abstract
[Objective]This study aims to clarify the biological characteristics of Neopestalotiopsis egyptiaca,the causal agent of guava twig blight,and screen effective fungicides to provide a theoretical basis for disease control.[Method]The effects of different culture conditions on fungal growth and conidial germination were determined through single-factor experiments.The inhibitory effects of six common chemical fungicides were evaluated using the mycelial growth rate method.[Result]The optimal mycelial growth was observed at 25℃,pH 5.0,and under 24 h light exposure.In contrast,sporulation was significantly enhanced at 20℃,pH 10.0,and under 12 h light conditions.The optimal conidial germination occurred at 25℃and pH 7.0.Furthermore,both mycelia and conidia exhibited certain salt tolerance.Among the six tested fungicides,thiophanate-methyl and pyraclostrobin showed the strongest inhibitory effects,with half maxmal effective concentration(EC50)of 0.698 6 and 1.405 4 μg·mL-1,respectively.Kasugamycin and mancozeb also demonstrated inhibitory activity,with EC50 of 244.477 1 and 365.990 5 μg·mL-1,respectively.[Conclusion]N.egyptiaca exhibits strong adaptability,thriving across a wide range of temperatures and pH levels.In vitro toxicity tests indicate that thiophanate-methyl and pyraclostrobin are the most effective fungicides and should be prioritized for field control.关键词
番石榴枝枯病/新拟盘多毛孢/生物学特性/药剂筛选Key words
Guava twig blight/Neopestalotiopsis egyptiaca/Biological characteristic/Fungicide screening分类
农业科技引用本文复制引用
吴彩瑶,杨文莉,何龚雯,杨桂琴,朱梨梨,韦凤月,李敏慧,姜大刚..番石榴枝枯病菌生物学特性及防治药剂筛选[J].华南农业大学学报,2026,47(3):485-492,8.基金项目
汕头市农村科技特派员驻镇帮镇扶村项目(STKJ202209044) （STKJ202209044）
